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Table 1 General characteristics of pregnant and postpartum women according to whether admitted to ICU or not

From: Variability in intensive care unit admission among pregnant and postpartum women in Canada: a nationwide population-based observational study

 

Pregnancies with ICU admission* (n = 10,204)

Pregnancies without ICU admission* (n = 3,152,099)

Standardized difference

Delivery admissions

9001 (88.2%)

3,020,112 (95.8%)

− 0.28

Antepartum admissions

2596 (25.4%)

250,372 (7.9%)

0.48

Postpartum admissions

2583 (25.3%)

58,652 (1.9%)

0.73

Abortions or ectopic pregnancy-related admissions

918 (9.0%)

107,097 (3.4%)

0.23

Age (years) (mean ± SD)

30.5 ± 6.3

29.5 ± 5.6

0.16

 < 15

8 (0.08%)

1191 (0.04%)

0.22

 15–19

475 (4.7%)

136,868 (4.3%)

 

 20–24

1365 (13.5%)

480,141 (15.3%)

 

 25–29

2491 (24.6%)

913,371 (29.0%)

 

 30–34

3042 (30.0%)

1,006,926 (32.0%)

 

 35–39

2026 (20.0%)

500,255 (15.9%)

 

 40–44

653 (6.4%)

102,423 (3.2%)

 

 45+

81 (0.8%)

5932 (0.2%)

 

Gestational week at delivery admission (weeks)

36.0 ± 4.7

38.7 ± 2.5

− 0.72

Maternal comorbidity index

1.62 ± 2.06

0.47 ± 0.84

0.73

Live birth

9005 (88.2%)

3,020,305 (95.8%)

− 0.28

Singleton birth

8535 (83.6%)

2,970,321 (94.2%)

− 0.34

Twin birth

484 (4.7%)

51,029 (1.6%)

0.18

> Triplet birth

17 (0.2%)

1780 (0.06%)

0.03

Parity

0.17

 0

6598 (64.7%)

1,829,634 (58.0%)

 

 1

1939 (19.0%)

818,031 (26.0%)

 2+

1667 (16.3%)

504,434 (16.0%)

Residence rurality (0.7% missing)

- 0.01

 Urban

8225 (81.2%)

2,559,659 (81.8%)

 

 Rural

1907 (18.8%)

568,117 (18.2%)

Residence income quintile (14.0% missing)

0.11

 Quintile 1 (lowest)

2603 (29.3%)

684,917 (25.3%)

 

 Quintile 2

1929 (21.7%)

571,796 (21.1%)

 Quintile 3

1659 (18.7%)

523,475 (19.3%)

 Quintile 4

1485 (16.7%)

493,408 (18.2%)

 Quintile 5 (highest)

1212 (13.6%)

435,658 (16.1%)

Hospital rurality (0.6% missing)

− 0.01

 Urban

9917 (97.8%)

3,066,345 (97.9%)

 

 Rural

224 (2.2%)

66,429 (2.1%)

Delivery mode

 Vaginal

2148 (21.0%)

2,157,286 (68.4%)

− 1.08

 Cesarean section

4425 (43.4%)

817,172 (25.9%)

 

Transfer to another institution for acute care

1594 (15.6%)

38,350 (1.2%)

0.54

Readmission

1381 (13.5%)

42,338 (1.3%)

0.48

Province or territory of admission

 Newfoundland and Labrador

260 (2.5%)

51,481 (1.6%)

0.25

 Prince Edward Island

39 (0.4%)

15,410 (0.5%)

 

 Nova Scotia

226 (2.2%)

95,713 (3.0%)

 New Brunswick

298 (2.9%)

80,163 (2.5%)

 Ontario

5967 (58.5%)

1,524,080 (48.3%)

 Manitoba

376 (3.7%)

181,367 (5.7%)

 Saskatchewan

494 (4.8%)

158,537 (5.0%)

 Alberta

1177 (11.5%)

553,741 (17.6%)

 British Columbia

1308 (12.8%)

473,437 (15.0%)

 Territories

59 (0.6%)

18,170 (0.6%)

Severe maternal morbidity (any versus none)

5017 (49.2%)

44,995 (1.4%)

1.31

 0 (number of severe maternal morbidity events)

4588 (45.0%)

3,106,352 (98.5%)

1.48

 1

2616 (25.6%)

41,884 (1.3%)

 

 2

1351 (13.2%)

2890 (0.09%)

 3

719 (7.0%)

625 (0.02%)

 ≥ 4

930 (9.1%)

348 (0.01%)

Length of hospital stay (days)

11.1 ± 16.4

2.7 ± 3.3

0.71

Hospital mortality during episode of pregnancy care

130 (1.3%)

65 (0.00%)

0.16

Hospital group according to hospital volume of pregnancy

 1 (lowest volume)

204 (2.0%)

19,476 (0.6%)

0.15

 2

203 (2.0%)

66,852 (2.1%)

 3

818 (8.0%)

211,392 (6.7%)

 4

2165 (21.2%)

598,849 (19.0%)

 

 5 (highest)

6814 (66.8%)

2,255,530 (71.6%)

  1. *Data are presented as mean ± SD, median [interquartiles] or %
  2. Standardized difference = difference in means or proportions divided by standard error. Standardized mean differences of 0.2, 0.5, and 0.8 are often/generally equated to effect sizes of small, medium, and large, respectively